Female followers of CND (3)
I believe the answer is:
doe
'female' is the definition.
(female deer)
'followers of cnd' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found within the answer.
The remaining letters 'de' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for doe that I've seen before include "possible mate for Rudolph?" , "A female deet" , "Last FA Cup winners" , "Animal" , "Feminine counterpart of stag" .)